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Nutrition | Science of Nutrition | | A nutrient is a substance required by an organism for growth and the sustainment of life. So- called nonessential nutrients are those that can be synthesized by the cell if they are absent from the food. Essential nutrients cannot be synthesized within the cell and must be present in the food. In most living organisms nutrients serve three functions: they provide the energy and electrons necessary for certain vital processes and various materials from which all structural components and enzymes (biological catalysts) can be assembled.
Nutrition is the study of all the processes by which micro-organisms, plants, and animals absorb and utilize food substances.
The text article covers functions of food, nutritional evolution of organisms, methods of ingestion or penetration of nutrients, determination of essential nutrient requirements, essential inorganic and organic nutrients, comparative magnitudes of the requirements for different types of nutrients, and syntrophism.
Nutritional diseases and disorders, adverse effects of a deficiency or excess of certain nutrients in body tissues. These effects are most often caused by a faulty diet that is either lacking or excessive in one or more of the essential nutrients or food groups. Less commonly, they may result from constitutional metabolic defects that prevent optimum digestion, absorption, or utilization of the ingested food. |
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